It is easy to think that we should answer a maths question in the order that it is presented to us - this seems to make sense right?
However, this isn't always the case and we need to know the rules to make sure we answer questions correctly.
This is where BIDMAS/BODMAS comes in!
BIDMAS stands for:
Brackets, Powers or Indices, Division and Multiplication, Addition and Subtraction
(BODMAS means the same thing but the O in BODMAS stands for Orders instead of Indices)
The words that are represented in BIDMAS/BODMAS tell us the order in which we must perform the operations.
However, remember that multiplication and division are equally important, so in a calculation just involving multiplication and division, carry this out from left to right.
The same is true of addition and subtraction - these two are also equally important, and so again we should carry this out from left to right.
6 + 9 ÷ 3 = 6 + 3 = 9 (divide first)
(6 + 9) ÷ 3 = 15 ÷ 3 = 5 (brackets first)
15 - 4 × 2 = 15 - 8 = 7 (multiply first)
(15 - 4) × 2 = 11 × 2 = 22 (brackets first)
4 × 32 = 4 × 9 = 36 (power first)
(4 × 3)2 = 122 = 144 (brackets first)
14 - 4 + 5 = 15 (equally important, so left to right)
Now, why don't you have a go at answering some questions using BIDMAS.
Come back and have another look at this page if you get stuck by clicking on the red help button on the screen.